In some ways, Natal looks like playing "air guitar". IMO, will wear thin.

[NJ5]

rover said:

I'm sure that MS are calling it 'hands-free' to clearly differentiate it from other systems, not a Wii-style controller. It's likely to prove that unlike the Wii system, this is something that actually tracks you (Wii tennis works if you stand stock still and flick your wrist around.)

(...)

And how exactly would movement in a tennis game work with Natal? You would need something like a full-sized tennis court to run around in, or pretending to run while standing still.

Once you add peripherals with buttons or sticks, most of Natal's appeal is lost. It gets kind of pointless to track your whole body when you're using a controller at the same time. I guess there would still be some interesting possibilities, but it doesn't look very promising.